Why libre office hasn't adopted the tabbed many bar yet is beyond me ! They are probably not gonna be sued by Microsoft. It is just a huge ux improvement and would ease the friction for new comers especially that everyone is used to using tabbed bar on every other software.
I actually prefer it that way. With tabbed Ribbons (Is it how they're called?), I constantly have to look over and over again which tab the thing I need is located, ending up in question why X is put here but not there.
It improves discoverability for new users, just like having menus and submenus instead of a single list of commands, or just a command prompt.
If you're used to the old ways, of course it doesn't help... and if you know your shortcuts or command line commands, even a menu becomes a hindrance 🤷
Based on this comment section, it isn't all that clear which one should be the default... probably a compromise could be made by adding a more obvious way to switch between the modes.